package com.smartpro.mis.rest.common.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

public class ExcelUtil {


    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response){

        ExportParams exportParams = new ExportParams(title, sheetName);

        exportParams.setCreateHeadRows(isCreateHeader);

        defaultExport(list, pojoClass, fileName, response, exportParams);



    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName, HttpServletResponse response){

        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));

    }

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response){

        defaultExport(list, fileName, response);

    }



    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {

        Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);

        if (workbook != null);

        downLoadExcel(fileName, response, workbook);

    }



    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {

        try {

            response.setCharacterEncoding("UTF-8");

            response.setHeader("content-Type", "application/vnd.ms-excel");

            response.setHeader("Content-Disposition",

                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));

            workbook.write(response.getOutputStream());

        } catch (IOException e) {

            throw new RuntimeException(e.getMessage());

        }

    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {

        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);

        if (workbook != null);

        downLoadExcel(fileName, response, workbook);

    }



    public static <T> List<T> importExcel(String filePath,Integer titleRows,Integer headerRows, Class<T> pojoClass){

        if (StringUtils.isBlank(filePath)){

            return null;

        }

        ImportParams params = new ImportParams();

        params.setTitleRows(titleRows);

        params.setHeadRows(headerRows);

        List<T> list = null;

        try {

            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);

        }catch (NoSuchElementException e){

            throw new RuntimeException("模板不能为空");

        } catch (Exception e) {

            e.printStackTrace();

            throw new RuntimeException(e.getMessage());

        }

        return list;

    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass)  {

        if (file == null){

            return null;

        }

        ImportParams params = new ImportParams();

        params.setTitleRows(titleRows);

        params.setHeadRows(headerRows);

        List<T> list = null;

        try {

            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);

        }catch (NoSuchElementException e){

            throw new NoSuchElementException("excel文件不能为空");

        } catch (Exception e) {

            throw new  RuntimeException(e.getMessage());

        }

        return list;

    }

}
